Source code

Revision control

Copy as Markdown

Other Tools

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef ReaderProxy_h_
#define ReaderProxy_h_
#include "mozilla/AbstractThread.h"
#include "mozilla/RefPtr.h"
#include "nsISupportsImpl.h"
#include "MediaEventSource.h"
#include "MediaFormatReader.h"
namespace mozilla {
* A wrapper around MediaFormatReader to offset the timestamps of Audio/Video
* samples by the start time to ensure MDSM can always assume zero start time.
* It also adjusts the seek target passed to Seek() to ensure correct seek time
* is passed to the underlying reader.
class ReaderProxy {
using MetadataPromise = MediaFormatReader::MetadataPromise;
using AudioDataPromise = MediaFormatReader::AudioDataPromise;
using VideoDataPromise = MediaFormatReader::VideoDataPromise;
using SeekPromise = MediaFormatReader::SeekPromise;
using WaitForDataPromise = MediaFormatReader::WaitForDataPromise;
using TrackSet = MediaFormatReader::TrackSet;
ReaderProxy(AbstractThread* aOwnerThread, MediaFormatReader* aReader);
media::TimeUnit StartTime() const;
RefPtr<MetadataPromise> ReadMetadata();
RefPtr<AudioDataPromise> RequestAudioData();
RefPtr<VideoDataPromise> RequestVideoData(
const media::TimeUnit& aTimeThreshold, bool aRequestNextVideoKeyFrame);
RefPtr<WaitForDataPromise> WaitForData(MediaData::Type aType);
RefPtr<SeekPromise> Seek(const SeekTarget& aTarget);
RefPtr<ShutdownPromise> Shutdown();
void ReleaseResources();
void ResetDecode(TrackSet aTracks);
nsresult Init() { return mReader->Init(); }
bool UseBufferingHeuristics() const {
return mReader->UseBufferingHeuristics();
bool VideoIsHardwareAccelerated() const {
return mReader->VideoIsHardwareAccelerated();
TimedMetadataEventSource& TimedMetadataEvent() {
return mReader->TimedMetadataEvent();
MediaEventSource<void>& OnMediaNotSeekable() {
return mReader->OnMediaNotSeekable();
size_t SizeOfAudioQueueInFrames() const {
return mReader->SizeOfAudioQueueInFrames();
size_t SizeOfVideoQueueInFrames() const {
return mReader->SizeOfVideoQueueInFrames();
void ReadUpdatedMetadata(MediaInfo* aInfo) {
AbstractCanonical<media::TimeIntervals>* CanonicalBuffered() {
return mReader->CanonicalBuffered();
void SetCDMProxy(CDMProxy* aProxy) { mReader->SetCDMProxy(aProxy); }
void SetVideoBlankDecode(bool aIsBlankDecode);
void SetCanonicalDuration(
AbstractCanonical<media::NullableTimeUnit>* aCanonical);
void UpdateMediaEngineId(uint64_t aMediaEngineId);
RefPtr<MetadataPromise> OnMetadataRead(MetadataHolder&& aMetadata);
RefPtr<MetadataPromise> OnMetadataNotRead(const MediaResult& aError);
void UpdateDuration();
RefPtr<SeekPromise> SeekInternal(const SeekTarget& aTarget);
RefPtr<ReaderProxy::AudioDataPromise> OnAudioDataRequestCompleted(
RefPtr<AudioData> aAudio);
RefPtr<ReaderProxy::AudioDataPromise> OnAudioDataRequestFailed(
const MediaResult& aError);
const RefPtr<AbstractThread> mOwnerThread;
const RefPtr<MediaFormatReader> mReader;
bool mShutdown = false;
Maybe<media::TimeUnit> mStartTime;
// State-watching manager.
WatchManager<ReaderProxy> mWatchManager;
// Duration, mirrored from the state machine task queue.
Mirror<media::NullableTimeUnit> mDuration;
} // namespace mozilla
#endif // ReaderProxy_h_